Nobody gets into crypto because they're excited about taxes. But ignoring this topic is how small problems become expensive ones. The IRS and most other tax authorities have been very clear: cryptocurrency is taxable, and not reporting it is not a grey area.
In most countries, including the United States, cryptocurrency is treated as property for tax purposes. That means every time you sell, trade, or spend crypto, you potentially create a taxable event. Bought Bitcoin at $30,000 and sold at $50,000? That $20,000 gain is taxable income. The fact that you never touched cash doesn't matter.
The same rules apply to trading one cryptocurrency for another. Swapping Ethereum for Solana is treated as selling your Ethereum — you calculate the gain or loss at the time of the trade. DeFi is especially complicated: yield, staking rewards, and liquidity pool transactions all have tax implications that vary by jurisdiction and are still being worked out by regulators. The practical advice is simple: keep records of everything from day one, use crypto tax software, and when in doubt, consult a tax professional who understands crypto.